Why does CaOH2 dissolve in water?

Answer 1

The oxide ion in CaO (O2-) is a very strong base, meaning it will easily take a hydrogen ion (H+) from a molecule. In water the oxide ion take a hydrogen ion from a water molecule, forming to hydroxide ions.

O2- + H2O --> 2OH-

In this reaction the oxide ion acts as a base and the water molecule as an acid, at least by the Bronsted-Lowry definition.

Answer 2

The reaction is Ca + H2O ---> Ca(OH)2 .

Calcium is a metal and metals generally mix with water (H2O) to form basic hydroxides. Thus, a reaction involving Calcium and Oxygen results in the formation of Calcium Hydroxide.

Answer 3

1. Calcium hydroxide is a polar compound.
2. The solubilty of calcium hydroxide in water is not important.

Answer 4

CO2+Ca(OH)2= CaCO3+ H2O

Answer 5

CaO(s) + H2O(l) -> Ca(OH)2 (aq)